Minimize ASAR Products Anomalies

Occasionally, ASAR data acquired over specific time intervals is of degraded quality. Data quality disclaimers are issued for each of those intervals. The list below provides the data disclaimers for the whole mission in date order.
 

Start UTC Stop UTC Warning Code Affected Data Note
01-Mar-2002 00:00:00

 

10-Feb-2006 00:00:00

 

Degraded product quality

All ASAR Alternating Polarisation (AP) Level 1 products processed with PF-ASAR versions lower than 4.1.1

There is a shift in the zero-Doppler azimuth times annotated in the AP Level 1 products (this applies to the product zero-Doppler times and does not apply to other external times, such as the state vectors azimuth times). Full details on the impact on the product geolocation accuracy and the strategy for correcting products 'a-posteriorly' can be found here. The shift in the zero-Doppler azimuth times for AP level 1 products has been solved for the products processed with PF-ASAR version 4.02 and above.

13-Apr-2002 00:00:00

 

11-Feb-2003 00:00:00

 

Degraded product quality

All ASAR Level 1 products

The absolute calibration factor annotated in all ASAR level 1 products acquired between 13-APR-2002 and 11-FEB-2003 and processed between 01-AUG-2003 and 29-NOV-2004 is not correct. These products with incorrect calibration factor annotated in the Main Processing Parameters ADS can be identified by checking the auxiliary files used for processing. The name of the auxiliary files used in the processing is provided in the product SPH (use "view as HTML" in EnviView to visualise them). Products with incorrect calibration factor have been processed with the following external calibration auxiliary file: ASA_XCA_AXVIEC20030801_134802_20020413_000000_20030211_000000

10-Jul-2003 20:20:00

 

11-Jul-2003 16:57:00

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

03-Aug-2003 21:15:00

 

04-Aug-2003 12:43:00

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

19-Oct-2003 12:50:59

 

20-Oct-2003 15.37.47

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

28-Oct-2003 06:26:28

 

28-Oct-2003 13:10:01

 

warning code: Data acquired in FPM

All ASAR products, including level 0 products

ASAR is nominaly operating in Stellar Yaw Steering mode (SYSM). ASAR returned to nominal operation after an OCM manoeuvre performed on 28-OCT-2003 06:26:28 UTC, where the satellite was still in Fine Pointing Mode (FPM) and YSM operations were resumed at 18:01:01. Quality of ASAR data acquired in FPM (28-OCt-2003 06:26:28 until 10:10:01 UTC) might be degraded

18-Nov-2003 00:00:00

 

22-May-2004 00:00:00

 

Degraded ASAR Global Monitoring Mode location accuracy

All ASAR Global Monitoring level 1 products (ASA_GM1_1P) products.

ASA_GM1_1P products acquired during this period show a variable location error in azimuth, ranging up to 40 Km. The location error in ASA_GM1_1P products acquired before 22-May-2004 can be corrected on the user side simply by multiplying the line numbers in the Geolocation Grid ADS by 0.97169. The problem is fully corrected for GM data acquired since 22-May-2004 (i.e. no correction required to get a correct location accuracy).

04-Dec-2003 21:55:23

 

04-Dec-2003 22:03:31

 

ASAR Data acquired in FPM

All ASAR products, including level 0 products

ASAR is nominaly operating in Stellar Yaw Steering mode (SYSM). ASAR was recovered from PLSOL and returned to operations on 04-Dec-2003 21:05:23 UTC. ASAR was operated in Fine Pointing Mode (FPM) since 21:55:23 UTC until 22:03:31 UTC. Quality of ASAR data acquired in FPM (04-Dec-2003 21:55:23 UTC until 22:03:31 UTC) might be degraded.

11-Dec-2003 01:45:00

 

11-Dec-2003 15:11:15

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

04-Jan-2004 09:15:00

 

05-Jan-2003 15:25:20

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

13-Feb-2004 13:38:00

 

14-Feb-2004 11:06:01

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

20-Feb-2004 18:00:00

 

23-Feb-2004 13:08:00

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

21-Jun-2004 07:56:33

 

22-Jun-2004 11:50:18

 

ASAR in YSM (no in SYSM)

All ASAR products, including level 0 products

ASAR is nominaly operating in Stellar Yaw Steering mode (SYSM). Due to a temporary unavailability of the SYSM during this period, the instruments were operated in Yaw Steering Mode (YSM). Small differences in the attitude stability are expected with possible bias in the measured ASAR Doppler Centroid frequencies of 100-300 Hz.

04-Aug-2004 02:00:00

 

04-Aug-2004 09:26:00

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

12-Aug-2004 13:53:54

 

12-Aug-2004 19:09:50

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

14-Aug-2004 07:36:00

 

17-Aug-2004 10:57:45

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

12-Sep-2004 03:46:00

 

12-Sep-2004 12:40:00

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

16-Sep-2004 03:36:39

 

16-Sep-2004 08:53:15

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

02-Nov-2004 14:17:25

 

03-Nov-2004 10:04:58

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

05-Dec-2004 10:03:48

 

05-Dec-2004 15:35:42

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

09-Jan-2005 03:13:21

 

09-Jan-2005 06:45:03

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

25-Jan-2005 00:00:00

 

02-Feb-2005 00:00:00

 

Not Applicable

All ASAR Low bit rate products (Wave and GM), including level 0 products aquired at PDHS-E (ESRIN)

Due to a problem on the ESRIN Low Bit Rate acquistion chain, the ASAR Wave and GM data could be of bad quality.

22-Mar-2005 00:54:10

 

22-Mar-2005 09:09:10

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

12-May-2005 07:26:02

 

12-May-2005 10:50:00

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

18-May-2005 10:58:16

 

18-May-2005 13:58:00

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

01-Jun-2005 13:29:28

 

01-Jun-2005 16:45:00

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

05-Jul-2005 14:16:58

 

05-Jul-2005 17:27:11

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

24-Jul-2005 02:22:42

 

24-Jul-2005 07:31:40

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

03-Aug-2005 17:09:54

 

03-Aug-2005 22:08:56

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

24-Aug-2005 01:09:08

 

24-Aug-2005 07:55:55

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

14-Sep-2005 08:00:40

 

16-Sep-2005 19:57:33

 

ASAR antenna gain problem

Quality of ASAR Level-1 and Level-2

Quality of ASAR Level-1 and Level-2 products is slightly degraded due to a temporal modification of the antenna radiation patterns.Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

16-Sep-2005 19:57:33

 

14-Oct-2005 00:00:00

 

ASAR antenna gain problem

Quality of ASAR Level-1 and Level-2

Quality of ASAR Level-1 and Level-2 products acquired between 16-09-2005 19:57:33 UTC and 14-10-2005 00:00:00 is slightly degraded for NRT products while it is nominal products generated on-request after 14-10-2005 00:00:00. Quality of products acquired after 14-10-2005 00:00:00 is nominal.

21-Oct-2005 07:34:39

 

21-OCT-2005 09.34.58

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

20-Nov-2005 20:15:13

 

20-Nov-2005 23:28:50

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

11-Dec-2005 10:53:54

 

11-Dec-2005 14:14:52

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

25-Jan-2006 17:10:27

 

25-Jan-2006 20:31:34

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

22-Feb-2006 00:43:46

 

22-Feb-2006 11:21:32

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

22-Feb-2006 10:12:25

 

22-Feb-2006 15:14:13

 

Degraded ASAR Global Monitoring Mode radiometric quality

ASAR Global Monitoring Mode (GMM) products

Radiometric quality of ASAR Global Monitoring Mode (GMM) data acquired on 22 February from 10:12:25 UTC until 15:14:13 UTC, corresponding to orbits 20818, 20819 and 20820 may be degraded since a test with the ASAR instrument will be performed during this time. Data acquired during this time interval in modes other than GMM is NOT affected. GMM data acquired immediately before and after this period is NOT affected.

28-Feb-2006 02:37:34

 

28-Feb-2006 07:49:38

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

20-Mar-2006 02:12:44

 

20-Mar-2006 07:20:50

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

12-Apr-2006 19:53:48

 

12-Apr-2006 20:19:55

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

24-Apr-2006 03:47:51

 

24-Apr-2006 07:17:00

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

25-Apr-2006 13:22:31

 

25-Apr-2006 15:02:48

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

30-Apr-2006 10:53:00

 

30-Apr-2006 14:04:03

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

11-May-2006 03:13:20

 

11-May-2006 06:41:30

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

22-May-2006 07:32:43

 

22-May-2006 11:23:16

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

25-May-2006 02:33:46

 

25-May-2006 07:45:47

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

22-Jun-2006 16:00:00

 

22-Jun-2006 17:49:40

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

01-Jul-2006 03:00:00

 

01-Jul-2006 08:16:10

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

26-Jul-2006 13:15:00

 

26-Jul-2006 13:41:43

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

04-Aug-2006 07:15:00

 

04-Aug-2006 10:30:10

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

08-Aug-2006 01:38:00

 

08-Aug-2006 08:28:56

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

17-Aug-2006 03:26:46

 

21-Aug-2006 14:56:00

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

24-Aug-2006 12:56:47

 

24-Aug-2006 16:47:19

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

03-Sep-2006 01:19:40

 

03-Sep-2006 06:28:16

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

03-Sep-2006 16:05:12

 

03-Sep-2006 18:07:40

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

06-Oct-2006 07:35:40

 

06-Oct-2006 11:15:30

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

17-Oct-2006 16:23:20

 

17-Oct-2006 20:00:54

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

24-Oct-2006 04:43:30

 

24-Oct-2006 09:42:25

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

01-Nov-2006 00:00:00

 

28-Feb-2007 00:00:00

 

Degraded ASAR GM product quality

All ASAR GM products, including level 0 products

Due to archiving problem, the overall quality of ASAR GM products acquired between November 2006 and February 2007, covering the South America and Indonesia areas might be degraded. Processing artifacts as azimuth stripe and subswaths discontinuity are visible. A reprocessing activity is currently on-going. ASAR GM users are invited to check the available quick-looks by Eoli before ordering the products.

24-Dec-2006 07:51:56

 

24-Dec-2006 11:14:05

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

03-Jan-2007 07:37:20

 

03-Jan-2006 09:14:26

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

04-Feb-2007 16:51:13

 

23-Feb-2007 00:00:00

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. NRT products processed by the following auxiliary data: ASA_XCA_AXXIEC20061221_143253_20050916_195733_20071231_000000, ASA_CON_AXXIEC20061107_090002_20050916_195733_20071231_000000, ASA_CON_AXVIEC20070215_184018_20070204_165113_20071231_000000 has significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

03-Mar-2007 08:23:44

 

03-Mar-2007 12:05:49

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

15-Mar-2007 02:09:10

 

15-Mar-2007 07:05:53

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

17-Mar-2007 07:43:40

 

17-Mar-2007 11:00:38

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

15-Apr-2007 07:32:22

 

15-Apr-2007 09:33:26

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

27-Jun-2007 10:58:54

 

27-Jun-2007 12:43:10

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

22-Jul-2007 20:41:47

 

22-Jul-2007 21:36:04

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

04-Dec-2007 18:06:43

 

06-Dec-2007 00:17:30

 

Degraded geolocation accuracy

All ASAR products, including level 0 products

ASAR data acquired between orbits 30127 and 30145 show a variable location error in azimuth, ranging up to 12 Km. The problem is fully corrected for ASAR data acquired since orbit 30146.

25-Jul-2008 07:00:00

 

25-Jul-2008 11:40:00

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

31-Dec-2008 22:16:43

 

01-Jan-2009 06:39:43

 

Degraded geolocation accuracy

All ASAR products, including level 0 products

ASAR data acquired between orbits 35755 and 35759 show a variable location error in azimuth, ranging up to 6.18 Km. The problem is fully corrected for ASAR data acquired since orbit 35760.

15-Feb-2009 22:16:43

 

16-Feb-2009 13:09:00

 

Envisat Yaw Steering

All ASAR products, including level 0 products

Envisat switched automatically in Yaw Steering Mode (YSM) due to an anomaly which affected Star Tracker 3. The anomaly was caused by an unexpected bright object, different from the programmed star the star tracker was pointing to. The event was interpreted by the onboard software as two simultaneous target objects in the field of view and generated a suspension command, which in turn triggered the service module to switch to Yaw Steering Mode. The Yaw Steering Mode implies a slight degradation of the general attitude stability, which does not substantially affect instrument data quality. Products acquired during YSM were therefore archived and distributed nominally.

05-Mar-2009 19:18:01

 

06-Mar-2009 15:10:02

 

Envisat Yaw Steering

All ASAR products, including level 0 products

Envisat switched automatically in Yaw Steering Mode (YSM) due to an anomaly which affected Star Tracker 3. The anomaly was caused by an unexpected bright object, different from the programmed star the star tracker was pointing to. The event was interpreted by the onboard software as two simultaneous target objects in the field of view and generated a suspension command, which in turn triggered the service module to switch to Yaw Steering Mode. The Yaw Steering Mode implies a slight degradation of the general attitude stability, which does not substantially affect instrument data quality. Products acquired during YSM were therefore archived and distributed nominally.

12-Apr-2009 16:10:50

 

12-Apr-2009 19:20:00

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

26-Dec-2009 04:23:35

 

26-Dec-2009 08:14:53

 

ASAR antenna gain problem

All ASAR products, including level 0 products

Due to an on board anomaly, data acquired during this period is affected by a change of the antenna radiation pattern. The overall quality of these data is degraded. Radiometric normalisation of level 1 products is clearly corrupted, with significant residual antenna pattern modulation and differences from sub-swath to sub-swath in the ScanSAR cases (WS and GM).

11-Jan-2010 11:34:56

 

11-Jan-2010 19:05:37

 

Envisat Yaw Steering

All ASAR products, including level 0 products

Envisat switched automatically in Yaw Steering Mode (YSM) due to an anomaly. The Yaw Steering Mode implies a slight degradation of the general attitude stability, which does not substantially affect instrument data quality. Products acquired during YSM were therefore archived and distributed nominally.

26-May-2010 12:12:12

 

26-May-2010 16:45:02

 

Envisat Yaw Steering

All ASAR products, including level 0 products

Envisat switched automatically in Yaw Steering Mode (YSM) due to an anomaly. The Yaw Steering Mode implies a slight degradation of the general attitude stability, which does not substantially affect instrument data quality. Products acquired during YSM were therefore archived and distributed nominally.

26-Oct-2010 00:00:00

 

02-Nov-2010 00:00:00

 

Envisat Yaw Steering

All ASAR products, including Level 0 products

Between 22 October and 02 November 2010 ENVISAT was in Yaw Steering Mode (YSM) due to the planned orbit lowering manoeuvre, to ensure the continuation of the mission for an additional 3 years. A preliminary assessment of the data products of all instruments acquired between 26 October and 01 November has been performed to provide the users with information of the data quality starting from 02 November.

26-Nov-2010 22:00:00

 

09-Dec-2010 05:39:53

 

Wave Leap Frog Experiment

All ASAR Wave Mode products, including level 0 products

As an experiment run during this period, ASAR acquired Wave data in "leap-frog" mode, whereby the swath used from one imagette to another was switched between IS2 and IS4. Telemetry errors occurred as a result of this experiment, which resulted in corrupted source packets for all Wave products.

25-May-2011 22:02:15

 

06-Jun-2011 05:44:03

 

Wave Leap Frog Experiment

All ASAR Wave Mode products, including level 0 products

As an experiment run during this period, ASAR acquired Wave data in "leap-frog" mode, whereby the swath used from one imagette to another was switched between IS2 and IS4. Telemetry errors occurred as a result of this experiment, which resulted in corrupted source packets for all Wave products.

24-Jul-2011 22:17:41

 

24-Jul-2011 23:59:59

 

Wave Leap Frog Experiment

All ASAR Wave Mode products, including level 0 products

As an experiment run during this period, ASAR acquired Wave data in "leap-frog" mode, whereby the swath used from one imagette to another was switched between IS4 and IS4. Telemetry errors occurred as a result of this experiment, which resulted in corrupted source packets for all Wave products.